GB878215A - Light refracting and transmitting plates and equipment using the same - Google Patents
Light refracting and transmitting plates and equipment using the sameInfo
- Publication number
- GB878215A GB878215A GB37680/56A GB3768056A GB878215A GB 878215 A GB878215 A GB 878215A GB 37680/56 A GB37680/56 A GB 37680/56A GB 3768056 A GB3768056 A GB 3768056A GB 878215 A GB878215 A GB 878215A
- Authority
- GB
- United Kingdom
- Prior art keywords
- depressions
- moulding
- conical
- contiguous
- plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000000465 moulding Methods 0.000 abstract 3
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 abstract 1
- 239000011521 glass Substances 0.000 abstract 1
- 230000001788 irregular Effects 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 239000011347 resin Substances 0.000 abstract 1
- 229920005989 resin Polymers 0.000 abstract 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V5/00—Refractors for light sources
- F21V5/02—Refractors for light sources of prismatic shape
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
878,215. Light refracting plates. HOLOPHANE Ltd. Dec. 4, 1957 [Dec. 10, 1956], No. 37680/56. Drawings to Specification. Class 75(2). A light transmitting and refracting plate is provided on the exit surface with a light controlling configuration acting in all azimuths by providing on that surface separate contiguous or nearly contiguous recesses having their surfaces at a slope approximately equal 2 to - (90 degrees-C) where y is an odd integer y greater than 1 and C is the critical angle of the material. The depressions may be conical and arranged with their centres at the apices of equilateral triangles, the base circles being contiguous, overlapping or spaced apart to leave small flat areas in between. Other regular or irregular arrangements of the depressions may be used. Alternatively the depressions may be in the form of square based pyramids or triangular based pyramids. The conical depressions may be produced by moulding a plastic such as methyl methacrylate or by moulding transparent resin or glass using a die plate with conical projections. The pyramidal depressions are formed by moulding using a die plate machined by cutting intersecting sets of parallel V-section grooves, which may be spaced apart to leave narrow flats between zones of any of the sets. The sizes of the depressions may be varied in different parts of the plate. Specification 619,084 is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB37680/56A GB878215A (en) | 1956-12-10 | 1956-12-10 | Light refracting and transmitting plates and equipment using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB37680/56A GB878215A (en) | 1956-12-10 | 1956-12-10 | Light refracting and transmitting plates and equipment using the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB878215A true GB878215A (en) | 1961-09-27 |
Family
ID=10398215
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB37680/56A Expired GB878215A (en) | 1956-12-10 | 1956-12-10 | Light refracting and transmitting plates and equipment using the same |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB878215A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USD282589S (en) | 1983-02-18 | 1986-02-11 | K-S-H, Inc. | Light transmitting panel |
| US5308200A (en) * | 1991-12-13 | 1994-05-03 | Koito Manufacturing Co., Ltd. | Method of producing a die forming lens fisheye steps |
| WO1996017205A1 (en) * | 1994-11-30 | 1996-06-06 | Honeywell Inc. | Prismatic refracting optical array for liquid flat panel crystal display backlight |
| WO2005083317A1 (en) | 2004-02-20 | 2005-09-09 | Koninklijke Philips Electronics N.V. | A translucent lighting panel, a luminaire, and a method of manufacturing a panel |
| FR2870007A1 (en) * | 2004-05-10 | 2005-11-11 | Saint Gobain | TRANSPARENT SHEET TEXTURED WITH INCLINED PYRAMIDAL PATTERNS |
| WO2006114763A1 (en) | 2005-04-26 | 2006-11-02 | Koninklijke Philips Electronics N.V. | A luminaire and a lighting panel for a luminaire |
| EP2532953A1 (en) | 2011-06-10 | 2012-12-12 | Siteco Beleuchtungstechnik GmbH | Prism panel |
| EP2647904A1 (en) | 2012-04-05 | 2013-10-09 | Siteco Beleuchtungstechnik GmbH | Prism plate with varying flank angles |
| EP2647905A2 (en) | 2012-04-05 | 2013-10-09 | Siteco Beleuchtungstechnik GmbH | Prism plate with varying flank angles |
-
1956
- 1956-12-10 GB GB37680/56A patent/GB878215A/en not_active Expired
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USD282589S (en) | 1983-02-18 | 1986-02-11 | K-S-H, Inc. | Light transmitting panel |
| US5308200A (en) * | 1991-12-13 | 1994-05-03 | Koito Manufacturing Co., Ltd. | Method of producing a die forming lens fisheye steps |
| WO1996017205A1 (en) * | 1994-11-30 | 1996-06-06 | Honeywell Inc. | Prismatic refracting optical array for liquid flat panel crystal display backlight |
| US5579134A (en) * | 1994-11-30 | 1996-11-26 | Honeywell Inc. | Prismatic refracting optical array for liquid flat panel crystal display backlight |
| WO2005083317A1 (en) | 2004-02-20 | 2005-09-09 | Koninklijke Philips Electronics N.V. | A translucent lighting panel, a luminaire, and a method of manufacturing a panel |
| FR2870007A1 (en) * | 2004-05-10 | 2005-11-11 | Saint Gobain | TRANSPARENT SHEET TEXTURED WITH INCLINED PYRAMIDAL PATTERNS |
| WO2005111670A1 (en) * | 2004-05-10 | 2005-11-24 | Saint-Gobain Glass France | Textured transparent film having pyramidal patterns that can be associated with photovoltaic cells |
| WO2006114763A1 (en) | 2005-04-26 | 2006-11-02 | Koninklijke Philips Electronics N.V. | A luminaire and a lighting panel for a luminaire |
| US7631980B2 (en) | 2005-04-26 | 2009-12-15 | Koninklijke Philips Electronics, N.V. | Luminaire and a lighting panel for a luminaire |
| EP2532953A1 (en) | 2011-06-10 | 2012-12-12 | Siteco Beleuchtungstechnik GmbH | Prism panel |
| DE102011103981A1 (en) | 2011-06-10 | 2012-12-13 | Siteco Beleuchtungstechnik Gmbh | prism plate |
| EP2647904A1 (en) | 2012-04-05 | 2013-10-09 | Siteco Beleuchtungstechnik GmbH | Prism plate with varying flank angles |
| EP2647905A2 (en) | 2012-04-05 | 2013-10-09 | Siteco Beleuchtungstechnik GmbH | Prism plate with varying flank angles |
| DE102012102986A1 (en) | 2012-04-05 | 2013-10-10 | Siteco Beleuchtungstechnik Gmbh | Prism plate with varying flank angles |
| DE102012102987A1 (en) | 2012-04-05 | 2013-10-10 | Siteco Beleuchtungstechnik Gmbh | Prism plate with varying flank angles |
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